So, just yesterday I picked up a 68cm six ten, in black, with the gold pin striping around the lugs. It is quite massive, and truly I shouldn't ride bigger than a 64cm, but I just loved it so much I couldnt pass it up, especially at $120! Frame is super clean! All it needed was new tires and I am on the road with it today! :-)
I digress, my serial number starts with an 'I'. So, should I assume it is a 1980 model?